As the war neared its end, Deviss was dispatched to the planet Orto to support Jedi KnightNem Bees in the upcoming battle there. Bees managed to gain access to a HoloNet transceiver, with which he established contact with the Republic forces, and Deviss was ordered to arrive with his battalion of clone soldiers in-system at a designated time. Bees disabled the planet's shield generator just as the Republic strike force emerged from hyperspace. Deviss rendezvoused with Bees as the Republic forces landed, and together they began the task of removing the entrenched droid armies. After a week of fighting, Order 66[9]—a command for all clone troopers to execute their Jediofficers[10]—was issued. While Bees led an attack on the enemy lines, Deviss carried out the order, shooting and killing the Jedi Knight.[9]

Deviss survived many battles during the Clone Wars and was a capable leader. Even after his Jedi General was killed on Altyr V, he managed to rally his troops and win the battle for the Republic. The commander also showed his bravery when he defended wounded comrades on Geonosis by himself, receiving a medal for his actions.[2] Deviss was loyal to Supreme ChancellorPalpatine and the Republic, as he gunned down his commanding Jedi General during Order 66.[9] As a clone of Jango Fett,[3] Deviss stood 1.83 meters tall.[1]